Basing cement



March 10, 1931.

C. VAN VOORHIS BAS I NG CEMENT Original Filed Feb. 16, 1922 INVENTQR Ciei'us C Van oorhas BY %TTORNEY Patented Mar. 10, 1931 UNITED STATES PATENT OFFICE onn'rus cnm'ron van voonrns, or mnesron, NEW JERSEY, assrenoa rownsrmenousn namr comrm, a conronarrou or rnunsnvnm BASING CEMENT Original application filed February 16, 1922, Serial No. 536,942. Patent No. 1,614,506, dated January 18, 1927. Divided and this application filed November 23, 1926. Serial No. 150,232.

This invention relates to cementitious composition and more articularly to a cement for uniting a lamp ulb or the like to a base and is a division of my application Ser. No. 536,942, filed Feb. 16, 1922, relating to electrical devices, which issued Jan. 18, 1927, as Patent No. 1,614,506..

Gas lamps, especially those, having a 11- ing of neon gas, find considerable use for ornamental purposes or for sign lighting, and are particularly advantageous when used as small indicating or plot lamps. These lamps employ a relatively low current and, when they are-operated on commercial circuits,- it is desirable to provide a resistance in series with each lamp for the purpose of preventing the passage of excessive currents therethrough. The stabilizing resistances frequently employed consist of separate units disposed in the line or of a-separate resistance element of such character as to be contained either in the interior of the lamp or in the base thereof. My invention concerns itself with improving this part of the lamp.

One of the objects of my invention is to provide a basing cement having incorporated therewith an electrical conductive material to serve as a stabilizing resistance element pvhich may constitute an integral part of a amp.

Another object of my invention is the rovision of an element/which will serve a ou- .ble purpose, namely, that of a stabilizing resistance or electrical conductive element and as an adhesive medium for securing one portion of alamp to another.

A further object is the provision of an adhesive'cement containing a conductive material for use'as a bonding medium to unite a bulb to a lamp base.

The above objects may be accomplished by providing'a resistance or conductive material ment, is usually of a suitable consistency to permit its flow into the base. In practice, the base and bulb are properly juxtaposed until the cement is pressed against the sur face of the bulb and the inner surface of the base, after which the cement is hardened by baking, thus bondingthe base and the bulb.

In practicing my invention, I employ a' suitable basing cement and combine therewith a conductive material in suflicient proportions to provide a given resistance, the

necessary adhesive. property and the plas-.

ticity of the cement, previous to baking, being maintained.

By the provision of a resistance element incorporated in the cement, considerable advantage is derived, inasmuch as the necessity for external resistance devices is avoided and no appreciable amount of space is required forrmy resistance element when incorporated in a lamp.

The accompanying drawing illustrates an embodiment of my invention as applied to a lamp, part of the structure being shown in section. a

The lamp (partly illustrated) maybe of any desired type having an envelope 2 containing a filling of a suitable gas and provided with leading-in wires 3 and 4 which extend from, and are sealed in, a pressed portion 6 of the envelope. The leadin -in wires conduct current to electrodes %not shown) disposed within the envelope. The

electrodes may be of any suitable form, depending upon the use to be made of the lamp. A hollow threaded member or base 7 is pro vided and, in lamps of the ordinary type, this base is secured to the envelope by an adhesive medium or basing cement, and one of the leading-in wires of the lamp is connected to the base, the other leading-in wire being connected to an external contact member 8 which is insulated from the shell or body of the base by a separator 9 made of glass or other insulating material.

A lamp constructed according to my invention may be provided with a cement constituting a combined electrically conductive substance as a resistance and an adhesive substance 10- which cement as a whole may be termed a resistance element. An end 11 of the leading-in wire 4 projects from the envelope 2 a sufficient distance to permit a portion ands-consequently agiven areaj of the wire, to inakecontact with the: resistance element 10. The leading-in wire 3; extends through the resistance element and the b 7 and is solderedaor ot'lijerw I efsecu contact member'8. 1 1

As illustrated in the accompanying draw.-

ing, a portion of the leading-in wire'3" e'x-" tends through the resistance element. or cement 10, which construction necessitates provision of a layer of insulating material 12 to prevent shortllcircuiting pa the current: Such insulation maybe of any i 'desiredama teria'l and ,ma be appliedi by tllQyITlOSll con: venient' inethodly-lt e\l1as,i-lio vveverf, been found desirable toempldy: anylsuitablie insu;

lating varnishorawiscous water solutioirof sodium silicate which may? ibemapplied; toi'zthe' leading-in wire; by means ofza: brushz, T

r hen this coating is dry,:thelayrIZ-thus formed, furnishes canv seflicientinsulatiom In" order to moreizpositively,prevent anyrjcur rent from passing, through. thebase adjacent to" thetiehd of the lleadingsint=wirey3-a layer 14 of any suitable material as,-:for instance, b glass-wool,asbestos+fiber Ofthfii like maybe pend upon several factors, i. e., the diameter and length of the portion of the wire which makes contact with the element, the dimension of -the base and the conductivity of the cement i iiresistancek lefir'ient. fi-The latter factor is dependent upon the materials used ment conductive and the relative y I, eohduetive"materials aseii; "The composition which I have found to answen all the requirements preferably consistsofa mixture of a suitable filler as, for nsta e,ibari misulpha e or a mar l flour,

; g;bl .th ;endl asoi piejganrsuehas shlladoibakelite m which is added a suitable conductive substance, such aS a metallic 5 powder,

wf r anc r m y deaum un te p w'de eiii w ed a b nrte s x ur i f i ie -n Qm' tic t p oie ea ple W fo lei n disposed-between the end .ofithe b sei 7r-al i v the resistanceelementlO. yThus thecontaet -1 '8 is 1 more perfectly; insulated zfromuthe ;re-

sistance element. -When the invention, as aboveL-set-';;forth, s

applied to a lamp of well known fdl'm, in which a: so-called; flare; seal ;;is einplo'yed, there will be, instead of the press;fiagasillus;

'tratedsa space betweenthe-resistance element 10 and the envelope which may be filled with glass-wool or insulatinQmateriaL ,Thisfwill prevent the resistance "element, when] 1n--:;a {it plastic state, from flowing incontact with ileading-inwiresr- In practice, thelrequired portion *ofthe leading-in v wire 3; is 1' given a coating ,of the insulating material P12.-"A predetermined amount of plastic cement, ;containing-. the proper proportion f-conductive materiahfis then deposited in a base which iswslippedover the end (if-an envelopeoribulb',theleadingin wiiei3 being, at the same time,,-;threa'ded through, an-aperture i the contact ielement 8 fIQm WhlClLitrSllglltly projects=.;, 'l he cement is vthen hardened by theusualabalcing process, after Wliichjthe end-of the'leading- '111 wire. 3 is soldered-to ;,the contact ,elerne it 8. 'lVhen the base containing-the CQITIQIiU lS applied to thebulb, it is obvious thatthe leading-in wire 4 vwhich projects ifroniflthe bulb will be disposed (within thece nenaconsequently WllQllc'lZllB cement hardens, a firin contact is secured between the wire L and the cement orrcsistance element 10.

It will be appreciatedtliat; the of ,the cement O1 resistance element 10 will dei hyl' i cqhel lnatu dmv {Although I .have iobtainedlgood,resultsby 'qu e tb lfiv a thud '9 Albe t-helm parts means:of: pp imate y 5!v new 1 9 utiqnhe ar um; 5 11B at, m i efl ii and wpiowslereds phi W6 in e e a lyi ne venou'ghi'i t I The shella csol tiq a b prepared byf dis- -i-imw e edlblah d umethyl aiebho for broughta ec-mesh; screen.

"solvingith-methylalcohol.

i g' dntat .v g i v eats; are-m sn fic en y el tic and adhesiv by i the use of a shellac solution, it will'be evident het ii-f d si ab e-itheshel eeim yi be mixd wi h the confine-Ew Su sta e mid theiiffilley uitabl ve tile el ie bein tle kl th s i' x iire. p oducea pla ti composit on1 f relatively high temperatur v y akelite may i ti itedlfd sheb h aperr ucti is de ired, y-,be e loyed] as the substitute.

pprop ia :wiszcesit a l l l lj i ce fl ntie ,esistance sre- The ingredients are'intiinate1y mixe -anal poured andkdisposedjnia given relationjto one or more of he .QQIIlPQi P-PQ SJ cilia, de w which may be secured together by the'composition. Electrical conductors may be suitably disposed or embedded in the composition while in its lastic state and thus secured therein when t e composition has become hardened by baking.

By the use of my invention, it is possibleto manufacture glow lamps of very small size including a stabilizing resistance, and considerable advantage is thereby obtained. when it is desirable to employ a lamp having a small base, it is obvious that the desired results may be had by my comparatively simple construction and that a small lamp may be placed in a commercial line without expensive additions in the way of stabilizing resistance devices other than the self contained resistance element within the lamp.

The composition, when prepared in accordance with the above directions, is light in 2 weight, has a high temperature resistance,

does not crack in drying and possesses, in a high-degree, all the desired properties of a cement and a resistance element.

Since my invention may be embodied in many other forms than that shown and described, I do not wish to be restrictedto the exact form shown but intend to cover all modifications which lie within the scope of' the a pended claims. What is claimed is:

1. A basing cement consisting of a volatile solvent, an alcohol soluble gum, a conductive substance, barium sulphate and marble flour.

2. A basing cement consisting of a volatile 85 solvent, barium sulphate, marble flour, carbon and shellac.

3. A composition of matter consisting of the following substances substantially in roportion by weight indicated barium sulp ate 40 3 parts, marble flour 8 arts, powdered graphite 3 parts and a V0 atile' solvent in suitable proportion to produce a. plastic mixture.

4. A composition of matter consisting of j the following substances substantially in proportion by weight indicated barium sulphate 3 parts, marble flour 8 parts, powdered graphite 3 parts and a shellac solution 5 parts, the said solution consisting of one pound of shellac dissolved in 1 quart of methyl alcohol.

In testimony whereof, I have hereunto subscribed ny name this 20th day of Nov., 1926.

CLETU CLINTON VAN VOOBHIS. 

